Improved boiler for making paper-pulp



UNITED STATES PATENT OFFICE.

MORRIS L. KEEN, OF ROYERS FORD, PENNSYLVANIA.

IMPROVED BOILER FOR MAKING PAPER-PULP.

Specification forming part of Letters Patent No. 38,90l, dated June 16, 1863.

hereby declare the following to be a full, clear,

and exact description of the same, reference .being had to the accompanying drawings,

making a part of this specification, and which represents the boiler in elevation, with a portion of its upper part represented in section, to show the interior arrangement thereof.

In boilers where a perforated diaphragm is placed in the interior, and through which ditphragm the material out of which the pulp is to be made is to be charged into the cylinder, it is found that the material falling upon the diaphragm chokes up its openings, and, moreover, gets above or on top of the liquid, which it is the special object of the diaphragm to prevent. My object and purpose is to prevent this difficulty, and I have achieved it in a very simple manner.

My invention consists in connecting the man or feed hole in the shell of the boiler with the man or feed hole through the diaphragm by a perforated well or cylinder, so that the material can be charged through said well into the boiler without falling upon or clogging the perforated diaphragm.

To enable others skilled in the art to make and use my invention, I will proceed to describe the same, by reference to the drawings.

A represents a boiler, which stands vertically in the furnace or brick-work, and which. for strength and convenience has hemispherical ends, its body being cylindrical. This boiler is suspended to the brick-work or foundation by flanges 6, so that it may expand and contract without loosening itself in the foundation or its support. In the interior of the boiler, near its upper end, there is placed a perforated diaphragm, B, through the center of which there is an opening, 0 c, and at the top or crown of the boiler there is also a man or feed hole or opening, a a, and these two openings, at c, are connected by a perforated well or cylinder, G, to act as guide for the material being charged into the boiler and to prevent it from falling upon the perforated diaphragm, and thus not only choking its openings but getting on top of the liquid, which it is important to avoid as damaging to the pulp. The openings at c are respectively closed after the boiler is charged by the covers I) d, which may be secured in any of the known ways of securing man-hole covers in steamboilers. Above the perforated diaphragm B there is an expansion-chamber, I, into which the liquid contents of the boiler expand when the fire is applied to the boiler, while the perforated diaphragm B keeps the crude material always submerged.

E is a discharge-pipe at the bottom of the boiler A, and F, a stop or discharge valve for blowing out the contents of the boiler while under pressure when said contents have been sufficiently boiled. V

U is a steam-indicator and D asafet-y-valve, of any of the common constructions, and instead of their being placed at the top of the boiler they may be brought down to any convenient position or locality near the attendant, so as to be readily observed by him.

The boiler may be heated by the direct application of fire, or by any other convenient or known mode. but I prefer to use a direct application of the heat, and for this purpose use a fire car or truck, H, on wheels, which is withdrawn when the boiler is to be discharged and replaced immediately after the boiler is again refilled for service.

Having thus fully described the nature, object, and purpose of my invention, what I claim therein as new, and desire to secure by Letters Patent, is-- 1. A boiler provided with a perforated diaphragm and well, or their substantial equivalents, arranged in the manner and for the purpose described.

2. In combination With the boiler, the arrangement of the discharge pipe and valve for the purpose of blowing out or discharging the contents of the boiler, under pressure, substantially as and for the purpose set forth.

. MORRIS L. KEEN.

Witnesses:

JAMES THoMPsoN, ELIJAH SHARP. 

